Spear



g- 39, 1932- J. 5. JOHNSON 1,875,011

SPEAR Filed April 9, 1931 Patented Aug. 30, 1932 Areas @F JoHN s. JOHNSON, or LULING, TEXAS? SPEAK This invention relates to new and useful lmprovements in a. spear.

Que-object of the invention is to provide a spear of the character described, specially de 3 signed for use in pullingpipe stuck in awell ore'.

Another object of the invention is to provide, a tool ofthe character described that may bereadily inserted into a pipe in the Well bore and engaged therewith and through which'the pipe may be, pulled, or which may bereadily released from the pipe and withdrawn in case the stuck pipe cannot be dislodged and removed.

With the above and other objects in View, the inventi on relates to certain novel features of construction operation and arrangement of parts, an example of which is given in this specification and illustrated in the accom- 2o panying drawing wherein: p r

Figure 1 shows a side elevation of the spear partly in section and shown in engagement withthe pipe to be pulled.

FigurefQ'shows a cross sectional View there- I 0fta'kenon the line 2+2'of Figure 1.

Referring now more particularly to the drawing wherein like numerals of reference designate similar parts in each of the figures, thenumeral 1 designates a mandrel which is downwardly flared and whose lower end has the tapering guide point 2. The numeral 3 shank preferably designates a reduced formed integrally with the mandrel and wvhich has the external left hand threads. Threaded onto said shank there is the coupling 4 to which the tubular operating string .5 is connected preferably by right hand' threads. There are a plurality of downward- 1y tapering slips 6 whose surfaces have the '40 teeth 7 to engage with the pipe 8 to be pulled and the mandrel 1 has the external keys 9 which work between said slips. The upper ends of the slips are connected to a ring 10 which surrounds the lower end of the cou- "415 pling 4 and whose upper end has the inwardly extending flange 11. Threaded onto the lower end of the coupling there is a ring nut 12, which is engageable with said flange to prevent the detachment of the slips from the .50 coupling.

Application filed April 9, 1931. Serial No. 528,870.

There is a coil spring 13 around the coupling which is seated on the flange 11 and whose upper end engages the annular flange 14 on said coupling. I

Threaded into the upper end of the shanli b 3 there is a stop 15 for a purpose to be hereinafter stated.

In use the spear is assembled as shown in Figure 1 and inserted into the pipe to be pulled, the guide 2 directing the spear into co the pipe. The teeth 7 will be held by the spring 18 in frictional engagement with the inside wall of the pipe 8 and upon an'upward pull through the operating string 5, the mandrel 1 will expand the slips 6 into secure en- 'co gagement with the pipe 8. An upward pull may then be exerted on the string 5 and the pipe 8 thus dislodged and pulled. If the pipe 8 can not be pulled the operating string 5 and collar 4 may be turned to the right, the-" keys 9 holding the mandrel against turning. As the coupling 4; is turned on the threads 3, it will move upwardly and the ring nut 12 will engage the flange 11 and a continued rotationwill cause the mandrel 1 to move down- 575 wardly relative to the slips 6, permitting said slips to contract and release the pipe and the spear may then be pulled out, leaving the pipe in the bore. The stop 15 will prevent the complete detachment of the coupling 4 from so the shank'8.

The drawing and description disclosewhat is now considered a preferred form of the invention byway of illustration only while the broad principle of the invention will be desa finedby the appended claims.

WhatI claim is: I p

1. A releasable spear for pulling pipe including a mandrel having a tapered seat, a slip support, a slip carried by said supporti'ih: and adapted to engage the pipe to be pulled and having a seat, and means for connecting the mandrel to an operating string and through which the mandrel may be actuated into one position, relative to the slip, to bring) 9 said seats into cooperating relation whereby the slipis forced into secure engagement with the pipe,-and into another position to carry the seats out of cooperating relation to permit the slip to release said pipe. 10o

' 2. A releasable spear for pulling pipe ineluding a mandrel having a tapered seat, a slip support, a slip carried by said support,

and adapted to engage the pipe to be pulled and having a seat, means for connecting the bring said seats jinto cooperating relation whereby the slip is forced into engagement with the pipe and in another direction'to carry saidseats out of c0operating-relation 7 whereby the slip is permitted to release Said,

port about the mandrel, said slip being movpipe,

H and means for; preventing the relative rotation of the mandrel and slip. 4.. A rel-easing spear including'a tapering mandrel, a support associated therewith, an

expansible slip on said support about the mandrel, a coupling. having a threaded .coni nection with the mandrel, means on the coupling for limiting the range of longitudinal movementof the slip relativeto the coupling,

said mandrel, when moved into oneposition' relative to they slip being effective to expand the slip, and said coupling being effective,

,whenturned in, one direction relative to the -mandrel, to releasesaidmandrel from the slipto' permit the contraction of the slip.

i 7 5. A releasing spear including a mandrel havinga-tapering seat, a slip support asso actuating member whereby the slip may be unseated upon aflrelative rotation of said mandrel and actuating member in one direc- 1 tion. v ,e

6. A releasing spear including a mandrel having a tapering seat, a slip support associated withv the mandrel, an expansibleslip on the support about the mandrel, an actuat- A releasing spear, including a tapering mandrel, a support associated therewith, an expansible slip on said support about the mandrel, a coupling having a threadedc'on nection with the mandrel, means. on the coupling for limiting therange of longitudinal 5 movement of the slip relative to the coupling,

the slip seated against saidseat.

the slip may be e Xpanded,and into, another position away from said seat whereby the slip is permitted to contract, an actuating 7 member having a threaded connection with the mandrel, means on the actuatingmember engageable with the support andeli'ective to'unseat said slip upon the turning movement ofsaid actuating memberin one direction. V. 8. A releasable spear for pulling'pipe inslip support, an expansible slip on the-supable into one position onto said seat whereby the slip may be expanded, and into another position away from said seat whereby the slip is permittedto contract,=,a n actuating memberf'having a threaded connection with the mandrel, means on' the actuating "member engageable with the support andfeifective to unseat said slip upon the turning movement of said actuatingimember in one direction, and yi'eldable, means acting against said support and normally tending to hold 9. A releasablespearfor pulling pipe in "cludinga mandrel having a tapering seat, a

eluding a mandrelhaving a taperingzseat, I

a slip support, an-expansibleslip, on the support about the mandrel, said slip beingmov: able into one position onto said seat whereby the slip may beexpanded, and intoanother position away from said seat whereby the slip'is permitted to contract, an actuating member having a threaded connection with the mandrel, means on the actuatingmember engageablewith the support and effective to unseat said slip upon the turning movement of said actuatmgmember 1n one -d rect1on andmeans for preventing the relative rotation of the mandrel and slip but permitting their relative longitudinal movement, In testimony whereof I have signed my name to this specification.v

- 7 JOHN S. JOHNSON,

ing member having a threaded connection with the, mandrel, yieldable mean'snormally V V acting tohold the slip against said seat, and

interlocking means between the support-and actuating member whereby the" slip may be 7 i v unseated upon'a relative rotation of said mandrel and actuating member in one direction,

and means preventing the relative; rotation of the mandrel and slip.v

able into one'position onto said seat whereby I 5 I l1 

